I've been planning to add a few visualisation widgets like FFT, oscilloscope, goniometer, but that's not implemented right now. You can play around with a ScriptFX and drawing on a ScriptPanel, but it might be a little bit too much for the Javascript Engine.

Yes compiled as a fx plugin. Because this envelope plugins (called sidechain) used a lot in EDM genre for pumping the bass and lead instruments with kick
Sound generator is discarded when compilin it as fx. So it should be working like other fx'es. Rİght? But it's not working.